Measurement, Control & Protection for 

Electro-Processes and High Power Conversion

Passing electrical current through a sodium chloride and water solution releases chlorine gas. Three different types of process reaction vessels or cells are used: Mercury, Diaphragm, and Membrane. Electrical power costs range from 35% to 70% of the total cost of producing chlorine. Accurate electrical monitoring of chlorine processes improve process performance, cost visibility, environmental compliance, and safety.

Process Applications
In order to obtain the electrical information needed for effective process control, a single measurement of total process current is ideal. Membrane electrolyzer processes are typically powered by one rectifier. Diaphragm and Mercury electrolyzer processes are typically powered by multiple rectifiers in parallel.

High accuracy measurement of current and voltage are needed to…
  • Maximize production without exceeding membrane or cell current density limits
  • Provide current data to process systems for optimum control performance
  • Detect unexpected changes in process efficiency
  • Accurately evaluate impact of intended / trial process changes
  • Objectively compare multiple process lines

    Accurate multi-point measurement of current and voltage are needed to…
  • Monitor voltage drops in membrane cells for efficiency, condition and safety purposes

  • Links to applicable DynAmp product pages :
    LKCOfor high accuracy process current measurement utilizing fiber optic sensing technology
    LKPfor high accuracy process current measurement on Membrane and Diaphragm electrolyzers
    LKATfor metering accuracy process current measurement on Membrane electrolyzers
    Upgradesto improve performance of existing systems
    AMACSanode monitoring and control for mercury cell processes
    VDASvoltage monitoring for membrane process health and safety

    Power Conversion Applications
    Chlor-Alkali processes operate at their most efficient when the electrical supply is both stable and reliable. Current instability leads to numerous process efficiency problems thereby increasing costs. Such instability can cause process cell damage and even endanger staff and facility.

    Highly dependable and responsive measurement systems are needed to
  • Provide current data to rectifier control for optimum performance and stability
  • Provide overall multi-rectifier balance indication and management
  • Provide a backup ‘totalized’ current measurement signal for mainline current
  • Sense power conversion equipment failures to protect process, equipment, staff
  • Analyze rectifiers condition to determine condition & maintenance requirements

    Links to applicable DynAmp product pages :
    LKPfor high accuracy rectifier output measurement, control and balance
    LKATfor rectifier output measurement, control, balance with over/reverse current protection
    BCMRto protect rectifiers from over/reverse current events
    BRPfor basic reverse current protection for rectifiers
    RCEMfor internal rectifier analysis and condition monitoring
    Clamp-Onfor portable measurement

  • DynAmp, LLC
    3735 Gantz Road
    Grove City, OH, 43123, USA
    Tel: (+1) 614-871-6900
    Fax: (+1) 614-871-6910


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    ( formerly Halmar and LEM DynAmp )
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    Updated: March 2020